package com.demo.Main.FtpUtil;


import org.apache.commons.net.ftp.FTPClient;


import java.io.*;

/**
 * 通过FTP上传文件
 *
 * @Author zxc
 */
public class FTPTools {
    //设置私有不能实例化
    private FTPTools() {

    }
    /**
     * 上传
     *
     * @param hostname    ip或域名地址
     * @param port        端口
     * @param username    用户名
     * @param password    密码
     * @param workingPath 服务器的工作目
     * @param inputStream 要上传文件的输入流
     * @param saveName    设置上传之后的文件名
     * @return
     */
    public static boolean upload(String hostname, int port, String username, String password, String workingPath, InputStream inputStream, String saveName) {
        boolean flag = false;
        FTPClient ftpClient = new FTPClient();
        ftpClient.enterLocalPassiveMode();
        //1 测试连接
        if (connect(ftpClient, hostname, port, username, password)) {
            try {
                //2 检查工作目录是否存在
                ftpClient.changeWorkingDirectory(workingPath);
                if (ftpClient.changeWorkingDirectory(workingPath)) {
                    // 3 检查是否上传成功
                    if (storeFile(ftpClient, saveName, inputStream)) {
                        flag = true;
                        disconnect(ftpClient);
                    }
                }
            } catch (IOException e) {

                System.err.println(hostname + "文件上传失败");
                disconnect(ftpClient);
            }
        }
        return flag;
    }

    /**
     * 断开连接
     *
     * @param ftpClient
     * @throws Exception
     */
    public static void disconnect(FTPClient ftpClient) {
        if (ftpClient.isConnected()) {
            try {
                ftpClient.disconnect();
            } catch (IOException e) {
                System.out.println(ftpClient.getLocalAddress() + "文件发送失败");
            }
        }
    }

    /**
     * 测试是否能连接
     *
     * @param ftpClient
     * @param hostname  ip或域名地址
     * @param port      端口
     * @param username  用户名
     * @param password  密码
     * @return 返回真则能连接
     */
    public static boolean connect(FTPClient ftpClient, String hostname, int port, String username, String password) {
        boolean flag = false;
        try {
            //ftp初始化的一些参数
            ftpClient.connect(hostname, port);
            ftpClient.enterLocalPassiveMode();
            ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
            ftpClient.setControlEncoding("UTF-8");
            if (ftpClient.login(username, password)) {

                flag = true;
            } else {
                try {
                    disconnect(ftpClient);
                } catch (Exception e) {
                    System.out.println(hostname + "文件发送失败");
                }
            }
        } catch (IOException e) {

            System.out.println(hostname + "文件发送失败");
        }
        return flag;
    }

    /**
     * 上传文件
     *
     * @param ftpClient
     * @param saveName        全路径。如/home/public/a.txt
     * @param fileInputStream 要上传的文件流
     * @return
     */
    public static boolean storeFile(FTPClient ftpClient, String saveName, InputStream fileInputStream) {
        boolean flag = false;
        try {
            if (ftpClient.storeFile(saveName, fileInputStream)) {
                flag = true;

                disconnect(ftpClient);
            }
        } catch (IOException e) {
            disconnect(ftpClient);
            System.out.println("文件发送失败");
            //e.printStackTrace();
        }
        return flag;
    }
}

